The Oxford DNB article about this Beauchamp family states, [1]
Miles's brother and heir, Payn de Beauchamp (d. in or before 1155), was both outlived and overshadowed by his wife, Rohese [Rose] de Beauchamp (d. 1166). The daughter of Aubrey (II) de Vere (d. 1141), she had previously been married to the powerful Geoffrey de Mandeville, first earl of Essex (d. 1144). The connection between the two families remained close for some time, with the Beauchamps adopting a variation of the Mandeville arms. In common with most of their contemporaries the earlier Beauchamps had already made grants to religious houses, including St Albans and Bermondsey, but the Beauchamps' patronage of the church now moved onto a new plane with the foundation of a priory for Gilbertine nuns at Chicksands, Bedfordshire, c.1150. Although her husband, Payn, was associated with her in early charters, Rohese was always spoken of as the founder. … Rohese was also closely involved in the early stages of the foundation (c.1166) of Newnham Priory by her son Simon [ii] de Beauchamp (c.1145-1206/7). This conversion of the college of secular canons at St Paul's, Bedford, into a community of regular Augustinian canons was part of the widespread contemporary movement towards the regular monastic orders. … Simon was a generous patron of the church; he made several additions to Newnham's original endowment, and also made grants to Warden Abbey, Chicksands Priory, and the hospital of St John at Bedford.
[1] Kathryn Faulkner, "Beauchamp, de, family (per. c.1080–c.1265)," Oxford Dictionary of National Biography (Oxford University Press, 2004, online edition), [Oxford_Dictionary_National_Biography], [OxfordDNB(UM)].